You basically FOIL the letters like in math. First, outside, inside, last. For example if I have the dihybrid cross BbGGXBbgg then I would but the first letters of the first set (BbGG) together (BG), the outside letters (bG) the inside letters (BG) and the last letters (bG). Then you take the next set (Bbgg) and do the same thing so first letters (Bg) outside letters (bg) inside letters (Bg) and the last letters (bg). Then after that you take each of the letters and put them down like a normal 4 square punnet square.
Answer:
given,
rose combed rooster (R) × single combed hen (r)
RR × rr
↓
in F1 generation, all the chicks will be Rr
↓
in F2 generation, mating was done among their own group of Rr
Rr × Rr
↓
25% of RR 50% of Rr and 25% of rr
phenotypes of chicks in f2 generation = 3:1 ( 75% rose combed as R is dominant and 25% single combed)
genotype = 1:2:1 ( 1/4 homozygous rose comb [RR] : 2/4 heterozygous rose comb [Rr] :1/4 homozygous single comb [rr])
I think this is B: Yellow Flower Color
I think phenotypes focus on the <u>physical characteristics</u> rather than the alleles and genes (genotypes).
Answer: D) A young tadpole has gills, a tail and no legs
